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Date Posted: 19:09:57 03/31/04 Wed
Author: Michel
Subject: Re: Speed and image format
In reply to: Mike B 's message, "Re: Speed and image format" on 23:26:59 03/30/04 Tue


Hi Mike,

Other than increasing the computer speed/memory that is nothing that can be done easily. If it is just for display and zoom purposes, using TImage instead of TImageScrollBox will use less resources.

Best regards,

Michel


>Well, it is huge. 6670 X 5519. These are USGS drg
>files (geotiffs). Zooming would be hard to do without
>in this app. If i do not convert them to rgb then the
>speed is slow but acceptable. They look so much
>better in rgb though. Like I said, i am new to
>working with images, so anything obvious i may be
>missing, feel free to educate me.
>
>>
>>Hi Mike,
>>
>>What is the size in pixel of your image. A jpeg file
>>of 5MB is probably very large and there may not be
>>anything that can be done as this is just a lot of
>>memory to manage. You should definitely limit the
>>zooming. The next release will have an overview panel
>>which will be a "smarter" way to zoom by only zooming
>>part of an image instead of the entire image.
>>
>>Best regards,
>>
>>Michel
>>
>>
>>>>I converted some tif files (11 MB on average) to
>>jpegs
>>>>(now 5 MB on average) and the speed of my program
>has
>>>>halved: zooming, resizing the app. etc is horribly
>>>>slow.
>>>>
>>>>Any idea why that would be? I'm new to working with
>>>>images...
>>>
>>>
>>>It seems to be that the jpg is going to RGB color and
>>>the tif was in indexed color. if i switch the tif to
>>>RGB it is also very very slow. Can anything be done
>>>about this?

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